Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
In the transition to September, Ketchum observes a drop in the average high-temperature, moving from an agreeable 73.2°F (22.9°C) in August to a refreshing 63.7°F (17.6°C). An average minimum temperature of 43.2°F (6.2°C) marks the month of September.Humidity
In September, the average relative humidity is 44%.Rainfall
In September, the rain falls for 8.8 days. Throughout September, 0.87" (22mm) of precipitation is accumulated. Throughout the year, there are 107.7 rainfall days, and 15.63" (397mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall in Ketchum. September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 0.55" (14mm) of snow. In Ketchum, during the entire year, snow falls for 88.2 days and aggregates up to 69.45" (1764mm) of snow.Daylight
The average length of the day in September in Ketchum is 12h and 29min.On the first day of the month, sunrise is at 7:02 am and sunset at 8:12 pm. On the last day of September, in Ketchum, sunrise is at 7:34 am and sunset at 7:19 pm MDT.
Sunshine
In Ketchum, the average sunshine in September is 9.4h.UV index
The average daily maximum UV index in September in Ketchum is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: A daily maximum UV index of 3 in September translates into the following instructions:
Undertake precautions - Guarding against sun damage is counselled. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Boost your sun resistance with garments that are densely woven yet spacious. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Frequently asked questions
What is the temperature in September in Ketchum?
What is the average humidity in September in Ketchum?
How much does it rain in Ketchum in September?
When does it start to snow in Ketchum?
What is the average length of the day in September in Ketchum?
When are sunrise and sunset in September in Ketchum?
How long on average sun shines in September in Ketchum?
How high is the UV index in September in Ketchum?
Average temperature in September
Ketchum, ID
- Average high temperature in September: 63.7°F
The warmest month (with the highest average high temperature) is July (74.1°F).
The month with the lowest average high temperature is December (25°F).
- Average low temperature in September: 43.2°F
The months with the highest average low temperature are July and August (50.5°F).
The coldest month (with the lowest average low temperature) is January (8.4°F).
Average pressure in September
Ketchum, ID
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Ketchum, ID
- Average wind speed in September: 5.4mph
The windiest month (with the highest average wind speed) is July (6.3mph).
The calmest month (with the lowest average wind speed) is January (4.5mph).
Average humidity in September
Ketchum, ID
- Average humidity in September: 44%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is August (37%).
Average rainfall in September
Ketchum, ID
- Average rainfall in September: 0.87"
The wettest month (with the highest rainfall) is March (2.01").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in September
Ketchum, ID
- Average rainfall days in September: 8.8 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is July (5.9 days).
Average snowfall in September
Ketchum, ID
- Average snowfall in September: 0.55"
The month with the highest snowfall is February (15").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Ketchum, ID
- Average snowfall days in September: 0.5 days
The month with the highest number of snowfall days is March (16 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Ketchum, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in September
Ketchum, ID
- Average sunshine days in September: 19.7 days
The month with the most sunshine days is July (20.8 days).
The month with the least sunshine days is April (11.1 days).
Average UV index in September
Ketchum, ID
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Ketchum, ID
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 10).
Average visibility in September
Ketchum, ID
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
Ketchum, Idaho, USA
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